Looking at a googled top 100 list I guess it's AC/DC. For a brief time I once liked INXS and Silverchair. But I've only recently been discovering Nick Cave and the Bad Seeds, and I'm curious about Powderfinger because of the Neil Young reference in the name.
So I may have a different answer next year.
AC/DC = , I know and heard of them here in the US.
INXS = .
Silverchair = , NEVER heard of them here in the US.